Sphalerite from the Sweet Water Mine, in Missouri, United States has created quite a reputation for itself. These specimens are often referred to as "Ruby Jack Sphalerite" due to their red iridescence. Specimens from this location are often associated with chalcopyrite as seen here.
Sphalerite is a zinc sulfide mineral and is considered the world's most important ore of zinc. It gets its name from the Greek word sphalerous, meaning deceiving or treacherous. This is because it can often be difficult to identify this mineral by eyesight alone. It can contain up to 25% iron, making this mineral very dense and heavy in the hand.
Chemical Formula: (Zn,Fe)S
Size:5.2 x 4.5 x 2.6 in.
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